US4229398A - Method and apparatus for the continuous production of a block of reconstituted foam material - Google Patents
Method and apparatus for the continuous production of a block of reconstituted foam material Download PDFInfo
- Publication number
- US4229398A US4229398A US06/014,616 US1461679A US4229398A US 4229398 A US4229398 A US 4229398A US 1461679 A US1461679 A US 1461679A US 4229398 A US4229398 A US 4229398A
- Authority
- US
- United States
- Prior art keywords
- cavity
- binder
- foam
- crumb
- charge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/33—Agglomerating foam fragments, e.g. waste foam
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
- B29C44/10—Applying counter-pressure during expanding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
- B29C67/20—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for porous or cellular articles, e.g. of foam plastics, coarse-pored
- B29C67/207—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for porous or cellular articles, e.g. of foam plastics, coarse-pored comprising impregnating expanded particles or fragments with a binder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2075/00—Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2375/04—Polyurethanes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2475/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2475/04—Polyurethanes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
- Y10S264/07—Binding and molding cellular particles
Definitions
- This invention relates to a method for the continuous production of a block of reconstituted foam material, to apparatus for carrying out the method.
- Reconstituted foam material is conventionally made by mixing scrap foam (foam crumb) with a suitable binder, compressing the mixture in a mould of the desired dimensions, and heating the mixture in the mould (suitably by passing steam through the mixture) to cure the binder and form a solid product.
- the present invention will be described herein with particular reference to the production of reconstituted polyurethane foam, where the crumb comprises scrap polyurethane foam and where the binder comprises the reaction product of a polymeric polyol having terminal primary hydroxyl groups and an organic polyisocyanate.
- a reconstituted polyurethane foam is available from Dunlop Limited as REPOL (Registered Trade Mark).
- REPOL Registered Trade Mark
- a block of reconstituted foam material having a substantially uniform density throughout may be made by continuously moulding a plurality of such blocks, each block having a relatively limited thickness, one above the other in a cylindrical mould and arranging to join adjacent blocks together during the moulding process.
- a major end-use of reconstituted foam material is in floor-coverings, especially underlay for carpets and the like.
- a convenient method of forming reconstituted foam material into sheets of a thickness suitable for underlay is to take a cylindrical block of reconstituted foam material and to "peel" the block using commercially-available foam conversion equipment.
- a solid cylindrical moulding is "peeled” completely, sheeting of nonuniform configuration is produced since, at small diameters, the sheet will try to maintain the curvature of the cylinder.
- the alternative is to "peel” only so far as is possible to yield a sheet of uniform thickness and this results in an unacceptable amount of waste material.
- the present invention provides, in one aspect, a method for the continuous production of a cylindrical block of reconstituted foam material, the method comprising:
- the foam crumb may be a polyurethane foam crumb and the binder may be the reaction product of an organic polyisocyanate and a polymeric polyol having terminal primary hydroxyl groups.
- a core member may also be disposed axially relative to the cavity so that a product having a hollow axial core is produced.
- the present invention provides apparatus for the continuous production of a cylindrical block of reconstituted foam material, the apparatus comprising:
- the present invention provides apparatus as described in the immediately-preceding paragraph, the apparatus including a core member disposed axially relative to the cylindrical cavity (i), whereby a cylindrical moulding having a hollow axial core can be produced.
- the moulding cavity and the product will be of circular-cylindrical configuration.
- FIG. 1 is a schematic view, in longitudinal section, of apparatus suitable for the continuous production of a block of reconstituted foam material
- FIGS. 2A to 2E show the use of the apparatus of FIG. 1 in the continuous production of a block of reconstituted foam material.
- a cylindrical, open-ended mould 10 of diameter 5 feet and height 4 feet 6 inches is supported vertically on members 11 and 12.
- a 1 foot-diameter core 20 is supported along the axis of the mould by means of guide 21.
- the lower end of the mould is closed by means of support member 30, which is movable relative to the mould (e.g. from position XX to position YY) by means shown schematically at 31A and 31B.
- the upper end of the mould is provided with a compression member 40, this member having dimensions such that it is a sliding-fit within the mould 10 and being movable relative to the mould by means shown schematically at 41A and 41B.
- the mould is surrounded by a steam-jacket shown schematically at 50.
- a feed hopper 60 contains a mixture 70 of foam crumb and binder for placing in the mould.
- FIGS. 2A to 2E the bottom of the mould is closed by means of member 30 and a charge 71 of foam crumb and binder is placed therein (FIG. 2A).
- the compression member 40 is lowered into the mould and compresses the charge 71 between itself and the member 30 to form a solid product 71A (FIG. 2B).
- the product 71A is lowered (by means not shown) from the mould and maintained in a position relative to the mould so that a further charge 72 can be placed on top of it (FIG. 2C).
- the compression member is again lowered to compress the charge 72 into a solid product 82A (FIG. 2D).
- FIG. 2E shows a solid product (indicated generally at 80) resulting from a repetition of the processes shown in FIGS. 2C and 2D.
- the product 80 may be cut to any desired length (e.g. by means of a saw or other blade) in a direction perpendicular to its axis.
- time-scale of the various operations shown in FIGS. 2A to 2E is sufficiently short to ensure good bonding between successive compressed charges (e.g. between products 71A and 72A), it may be necessary to apply a thin coating of binder to the upper surface of one solid product (e.g. 71A) before inserting a further charge (e.g. 72).
- the lower surface 40A of the compression member 40 may be provided with a serrated profile to assist the production of a high surface area on the upper surface of one solid product (e.g. 71A) and ensure optimum bonding of a subsequent solid product (e.g. 72A) thereto.
- each of the solid products e.g. 71A and 72A
- the overall variation of density in the products is of the order of 5 Kg/m 3 above or below the mean density, compared to the variation of ⁇ 20 Kg/m 3 from the mean density found in solid reconstituted foams made by known methods (i.e. blocks of thickness 3 feet or greater).
Abstract
Method for the continuous production of a cylindrical block of reconstituted foam material. A charge of foam crumb (together with a binder) is placed in an open-ended mould, supported therein and compressed to a height of about one foot. The product is lowered from the mould and maintained relative thereto so as to provide a support to receive a further charge of foam crumb and binder. The further charge is compressed so that it unites with the first-mentioned charge. Further charges of crumb and binder are added, and the method-steps repeated, as often as necessary. An apparatus is provided in which the method may be performed.
Description
This invention relates to a method for the continuous production of a block of reconstituted foam material, to apparatus for carrying out the method.
Reconstituted foam material is conventionally made by mixing scrap foam (foam crumb) with a suitable binder, compressing the mixture in a mould of the desired dimensions, and heating the mixture in the mould (suitably by passing steam through the mixture) to cure the binder and form a solid product. The present invention will be described herein with particular reference to the production of reconstituted polyurethane foam, where the crumb comprises scrap polyurethane foam and where the binder comprises the reaction product of a polymeric polyol having terminal primary hydroxyl groups and an organic polyisocyanate. Such a reconstituted polyurethane foam is available from Dunlop Limited as REPOL (Registered Trade Mark). However, it will be appreciated that the method and apparatus of the present invention are equally applicable to the production of other (non-polyurethane) reconstituted foam materials.
When making reconstituted polyurethane foam materials by the method described in the immediately-preceding paragraph, it has been found that a wide variation in product density can and does occur. (For example, a moulding or reconstituted polyurethane foam having a thickness of 3 feet can exhibit a variation of up to 20 Kg/m3 above or below its mean density). Clearly, such a variation limits the usefulness of the reconstituted foam product and has, hitherto, meant that the cost of reconstituting foam scrap exceeds considerably the market value of the product. As a result, a considerable amount of foam scrap has hitherto been dumped.
We have now found that a block of reconstituted foam material having a substantially uniform density throughout may be made by continuously moulding a plurality of such blocks, each block having a relatively limited thickness, one above the other in a cylindrical mould and arranging to join adjacent blocks together during the moulding process.
A major end-use of reconstituted foam material is in floor-coverings, especially underlay for carpets and the like. A convenient method of forming reconstituted foam material into sheets of a thickness suitable for underlay (viz. 1/4 inch to 3/4 inch) is to take a cylindrical block of reconstituted foam material and to "peel" the block using commercially-available foam conversion equipment. However if a solid cylindrical moulding is "peeled" completely, sheeting of nonuniform configuration is produced since, at small diameters, the sheet will try to maintain the curvature of the cylinder. The alternative is to "peel" only so far as is possible to yield a sheet of uniform thickness and this results in an unacceptable amount of waste material.
We have now found that such wastage can be avoided by moulding a cylindrical block of reconstituted foam having a hollow axial core.
Accordingly, the present invention provides, in one aspect, a method for the continuous production of a cylindrical block of reconstituted foam material, the method comprising:
(a) Placing in a moulding cavity a mixture of foam crumb and a compatible binder;
(b) Compressing the mixture to a thickness of about 1 foot;
(c) Heating the mixture to cure the binder and form a solid product;
(d) Lowering said solid product from the moulding cavity and supporting said solid product relative to the cavity to provide a surface for the reception of a further mixture of foam crumb and binder;
(e) Placing a further mixture of foam crumb and binder above the solid product;
(f) Repeating steps (b) (c) (d) and (e) (above) until a block of the required thickness is obtained.
Preferably, the foam crumb may be a polyurethane foam crumb and the binder may be the reaction product of an organic polyisocyanate and a polymeric polyol having terminal primary hydroxyl groups. A core member may also be disposed axially relative to the cavity so that a product having a hollow axial core is produced.
In a second aspect, the present invention provides apparatus for the continuous production of a cylindrical block of reconstituted foam material, the apparatus comprising:
(i) A vertically-disposed, cylindrical, open-ended moulding cavity;
(ii) A support member, placed at the lower end of the cavity and movable relative thereto;
(iii) A compression member, placed at the upper end of the cavity and movable relative thereto;
(iv) Means to heat the cavity and any contents thereof.
In a preferred embodiment, the present invention provides apparatus as described in the immediately-preceding paragraph, the apparatus including a core member disposed axially relative to the cylindrical cavity (i), whereby a cylindrical moulding having a hollow axial core can be produced.
Throughout this specification, the term "cylindrical" (as applied to the moulding cavity or to the product) means "of uniform cross-section throughout".
Preferably, the moulding cavity and the product will be of circular-cylindrical configuration.
A continuous process for the production of a cylindrical block of reconstituted polyurethane foam will now be described, merely by way of example, with reference to the accompanying drawings.
In the drawings,
FIG. 1 is a schematic view, in longitudinal section, of apparatus suitable for the continuous production of a block of reconstituted foam material;
FIGS. 2A to 2E show the use of the apparatus of FIG. 1 in the continuous production of a block of reconstituted foam material.
Referring now to FIG. 1, a cylindrical, open-ended mould 10 of diameter 5 feet and height 4 feet 6 inches is supported vertically on members 11 and 12. A 1 foot-diameter core 20 is supported along the axis of the mould by means of guide 21.
The lower end of the mould is closed by means of support member 30, which is movable relative to the mould (e.g. from position XX to position YY) by means shown schematically at 31A and 31B.
The upper end of the mould is provided with a compression member 40, this member having dimensions such that it is a sliding-fit within the mould 10 and being movable relative to the mould by means shown schematically at 41A and 41B.
The mould is surrounded by a steam-jacket shown schematically at 50.
A feed hopper 60 contains a mixture 70 of foam crumb and binder for placing in the mould.
Referring now to FIGS. 2A to 2E, the bottom of the mould is closed by means of member 30 and a charge 71 of foam crumb and binder is placed therein (FIG. 2A). The compression member 40 is lowered into the mould and compresses the charge 71 between itself and the member 30 to form a solid product 71A (FIG. 2B). The product 71A is lowered (by means not shown) from the mould and maintained in a position relative to the mould so that a further charge 72 can be placed on top of it (FIG. 2C). The compression member is again lowered to compress the charge 72 into a solid product 82A (FIG. 2D).
FIG. 2E shows a solid product (indicated generally at 80) resulting from a repetition of the processes shown in FIGS. 2C and 2D. The product 80 may be cut to any desired length (e.g. by means of a saw or other blade) in a direction perpendicular to its axis.
In FIGS. 2A to 2E, the steam-jacket 50 has been omitted for clarity, but it is to be understood that some form of heating of the mould is necessary between charging and compressing each portion of foam crumb/binder mixture.
Although the time-scale of the various operations shown in FIGS. 2A to 2E is sufficiently short to ensure good bonding between successive compressed charges (e.g. between products 71A and 72A), it may be necessary to apply a thin coating of binder to the upper surface of one solid product (e.g. 71A) before inserting a further charge (e.g. 72).
The lower surface 40A of the compression member 40 may be provided with a serrated profile to assist the production of a high surface area on the upper surface of one solid product (e.g. 71A) and ensure optimum bonding of a subsequent solid product (e.g. 72A) thereto.
We have found that, where the thickness of each of the solid products (e.g. 71A and 72A) is restricted to around 1 foot, the overall variation of density in the products is of the order of 5 Kg/m3 above or below the mean density, compared to the variation of ±20 Kg/m3 from the mean density found in solid reconstituted foams made by known methods (i.e. blocks of thickness 3 feet or greater).
Claims (7)
1. A method for the continuous stepwise production of a cylindrical block of reconstituted foam material from foam crumb comprising:
(a) Placing in an open-ended moulding cavity a mixture of foam crumb and a binder compatible with said mixture;
(b) Compressing the mixture to a height of about 1 foot;
(c) Heating the mixture to cure the binder and form a solid product layer;
(d) Lowering said solid product layer from the moulding cavity and supporting said solid product layer relative to the cavity to provide a solid product layer surface at one end of said cavity for the reception of and binding to of a further mixture of foam crumb and binder;
(e) Placing a further mixture of foam crumb and binder on the solid product layer surface;
(f) Repeating steps (b) (c) (d) and (e) to create successively connected solid product layers until a block of the required length is obtained.
2. The method of claim 1, wherein the foam crumb comprises polyurethane foam.
3. The method of claim 1, wherein the binder comprises the reaction product of an organic polyisocyanate and a polymeric polyol having terminal primary hydroxyl groups.
4. The method of claim 1, wherein a core member is disposed axially relative to the moulding cavity, whereby a cylindrical block having a hollow axial core is produced.
5. An apparatus for the continuous production of a cylindrical block of reconstituted foam material comprising: a vertically-disposed, cylindrical, open-ended moulding cavity; a support member, placed at the lower end of said cavity and movable relative to said cavity; a compression member, placed at the upper end of the cavity and movable relative to said cavity for compressing a charge of foam crumb and binder in said cavity to a height of approximately one foot; means for feeding a charge of foam crumb and binder to said cavity; means for heating the cavity and a charge of foam crumb and binder therein; said compression member compressing a charge of foam crumb and binder and said heating means heating said cavity during said compression such that a layer of reconstituted foam material is formed, said support member being movable to lower said layer from said cavity to an extent that a surface of said layer previously contacting said compression member forms a cavity support surface for a subsequent charge of foam crumb and binder.
6. The apparatus of claim 5, wherein a core member is disposed axially relative to the moulding cavity.
7. The apparatus of claim 5, wherein the moulding cavity is of circular-cylindrical configuration.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8483/78A GB1594544A (en) | 1978-03-03 | 1978-03-03 | Reconstituted foam material |
GB8483/78 | 1978-03-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
US4229398A true US4229398A (en) | 1980-10-21 |
Family
ID=9853340
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US06/014,616 Expired - Lifetime US4229398A (en) | 1978-03-03 | 1979-02-23 | Method and apparatus for the continuous production of a block of reconstituted foam material |
Country Status (6)
Country | Link |
---|---|
US (1) | US4229398A (en) |
AU (1) | AU4475979A (en) |
DE (1) | DE2908161A1 (en) |
FR (1) | FR2418711A1 (en) |
GB (1) | GB1594544A (en) |
ZA (1) | ZA79806B (en) |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4734439A (en) * | 1984-01-26 | 1988-03-29 | Bayer Aktiengesellschaft | Foam-containing polyurethane(urea) compositions and process for the preparation thereof |
US4843105A (en) * | 1985-07-23 | 1989-06-27 | Bayer Aktiengesellschaft | Process for the preparation of filler-containing, antionically modified polyurethane (urea) compositions, the polyurethane (urea) compositions so-obtained, and the use thereof |
US5155146A (en) * | 1991-03-29 | 1992-10-13 | Reetz William R | Thermoplastic composite and method and apparatus of making the same |
US5286321A (en) * | 1990-12-21 | 1994-02-15 | Free-Flow Packaging Corporation | System and method for densifying expanded plastic foam materials |
US5356278A (en) * | 1991-03-29 | 1994-10-18 | Reetz William R | Apparatus for making a thermoplastic composite |
US5824246A (en) * | 1991-03-29 | 1998-10-20 | Engineered Composites | Method of forming a thermoactive binder composite |
US5840348A (en) * | 1995-09-15 | 1998-11-24 | Ultrapure Systems, Inc. | Automated carbon block molding machine and method |
GB2309714B (en) * | 1996-01-30 | 2000-02-23 | Robin Kenneth Mackenzie | Sound deadening floor construction |
US6301722B1 (en) | 1998-09-22 | 2001-10-16 | Brock Usa, Llc | Pads and padding for sports gear and accessories |
US20050237853A1 (en) * | 2002-04-11 | 2005-10-27 | Mobius Technologies, Inc. | Mixer |
US7244477B2 (en) | 2003-08-20 | 2007-07-17 | Brock Usa, Llc | Multi-layered sports playing field with a water draining, padding layer |
EP2077182A1 (en) * | 2008-01-02 | 2009-07-08 | Kun-Huang Chang | Method of recycling waste plastic foam materials |
US7662468B2 (en) | 2000-10-06 | 2010-02-16 | Brock Usa, Llc | Composite materials made from pretreated, adhesive coated beads |
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GB380825A (en) * | 1930-09-09 | 1932-09-26 | Peter Kopp | A method of and apparatus for the production of moulded articles from artificial resin and artificial resin-containing mixes |
FR1562998A (en) * | 1968-02-02 | 1969-04-11 |
-
1978
- 1978-03-03 GB GB8483/78A patent/GB1594544A/en not_active Expired
-
1979
- 1979-02-20 ZA ZA79806A patent/ZA79806B/en unknown
- 1979-02-23 US US06/014,616 patent/US4229398A/en not_active Expired - Lifetime
- 1979-03-02 DE DE19792908161 patent/DE2908161A1/en not_active Withdrawn
- 1979-03-02 AU AU44759/79A patent/AU4475979A/en not_active Abandoned
- 1979-03-05 FR FR7905612A patent/FR2418711A1/en active Granted
Patent Citations (12)
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US1803814A (en) * | 1926-01-11 | 1931-05-05 | Spengler Peter Joseph | Process of and apparatus for producing pressed bodies of powderous material |
US2307371A (en) * | 1941-08-13 | 1943-01-05 | Ray O Vac Co | Molding process |
US2892216A (en) * | 1955-10-12 | 1959-06-30 | Us Rubber Co | Expanded material and method of making same |
US3004293A (en) * | 1959-09-15 | 1961-10-17 | Werner H Kreidl | Method of treating a foamy material having a high water content and product obtained thereby |
US3042988A (en) * | 1959-10-19 | 1962-07-10 | Casius Corp Ltd | Plant for the manufacture of cellular light weight building elements |
US3164860A (en) * | 1961-11-09 | 1965-01-12 | Dyfoam Corp | Apparatus for uniformly mixing and charging a substance into a mold |
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US3198856A (en) * | 1963-05-29 | 1965-08-03 | Joseph P Hammond | Method of fabricating a composite nuclear fuel core element |
US3452122A (en) * | 1965-01-22 | 1969-06-24 | Gen Foam Products | Method of producing uniform colored foamed materials |
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US3452127A (en) * | 1965-12-28 | 1969-06-24 | Henry H Lovette | Method of making an innerspring body supporting article |
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Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4734439A (en) * | 1984-01-26 | 1988-03-29 | Bayer Aktiengesellschaft | Foam-containing polyurethane(urea) compositions and process for the preparation thereof |
US4801621A (en) * | 1984-01-26 | 1989-01-31 | Bayer Aktiengesellschaft | Foam-containing polyurethane(urea) compositions and process for the preparation thereof |
US4855052A (en) * | 1984-01-26 | 1989-08-08 | Bayer Aktiengesellschaft | Foam-containing polyurethane (urea) compositions and process for the preparation thereof |
US4843105A (en) * | 1985-07-23 | 1989-06-27 | Bayer Aktiengesellschaft | Process for the preparation of filler-containing, antionically modified polyurethane (urea) compositions, the polyurethane (urea) compositions so-obtained, and the use thereof |
US5286321A (en) * | 1990-12-21 | 1994-02-15 | Free-Flow Packaging Corporation | System and method for densifying expanded plastic foam materials |
US5155146A (en) * | 1991-03-29 | 1992-10-13 | Reetz William R | Thermoplastic composite and method and apparatus of making the same |
US5356278A (en) * | 1991-03-29 | 1994-10-18 | Reetz William R | Apparatus for making a thermoplastic composite |
US5824246A (en) * | 1991-03-29 | 1998-10-20 | Engineered Composites | Method of forming a thermoactive binder composite |
US5840348A (en) * | 1995-09-15 | 1998-11-24 | Ultrapure Systems, Inc. | Automated carbon block molding machine and method |
GB2309714B (en) * | 1996-01-30 | 2000-02-23 | Robin Kenneth Mackenzie | Sound deadening floor construction |
US6301722B1 (en) | 1998-09-22 | 2001-10-16 | Brock Usa, Llc | Pads and padding for sports gear and accessories |
US6357054B1 (en) | 1998-09-22 | 2002-03-19 | Brock Usa, Llc | Protective padding for sports gear |
US6453477B1 (en) | 1998-09-22 | 2002-09-24 | Brock Usa, Llc | Protective padding for sports gear |
US7662468B2 (en) | 2000-10-06 | 2010-02-16 | Brock Usa, Llc | Composite materials made from pretreated, adhesive coated beads |
US20100173116A1 (en) * | 2000-10-06 | 2010-07-08 | Bainbridge David W | Composite materials made from pretreated, adhesive coated beads |
US20050237853A1 (en) * | 2002-04-11 | 2005-10-27 | Mobius Technologies, Inc. | Mixer |
US7244477B2 (en) | 2003-08-20 | 2007-07-17 | Brock Usa, Llc | Multi-layered sports playing field with a water draining, padding layer |
EP2077182A1 (en) * | 2008-01-02 | 2009-07-08 | Kun-Huang Chang | Method of recycling waste plastic foam materials |
Also Published As
Publication number | Publication date |
---|---|
ZA79806B (en) | 1980-02-27 |
AU4475979A (en) | 1979-09-06 |
FR2418711A1 (en) | 1979-09-28 |
GB1594544A (en) | 1981-07-30 |
FR2418711B1 (en) | 1983-08-19 |
DE2908161A1 (en) | 1979-09-06 |
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AS | Assignment |
Owner name: DUNLOPILLO LIMITED, UNITED KINGDOM Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:DUNLOP LIMITED, A COMPANY OF DUNLOP HOUSE RYDER ST;REEL/FRAME:009005/0089 Effective date: 19971103 |